package com.bk.utils;

import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class AES {
	public static boolean initialized = false;

	public static String de(String encryptedData, String session_key, String iv) {
		// Map map = new HashMap();
		try {
			byte[] resultByte = AES.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(session_key),
					Base64.decodeBase64(iv));
			if (null != resultByte && resultByte.length > 0) {
				String userInfo = new String(resultByte, "UTF-8");
				// map.put("status", "1");
				// map.put("msg", "解密成功");
				// map.put("userInfo", userInfo);
				return userInfo;
			} else {
				// map.put("status", "0");
				// map.put("msg", "解密失败");
			}
		} catch (InvalidAlgorithmParameterException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		// Gson gson = new Gson();
		// String decodeJSON = gson.toJson(map);
		// System.out.println(decodeJSON);
		return null;
	}

	/**
	 * AES解密
	 * 
	 * @param content
	 *            密文
	 * @return
	 * @throws InvalidAlgorithmParameterException
	 * @throws NoSuchProviderException
	 */
	public static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte)
			throws InvalidAlgorithmParameterException {
		initialize();
		try {
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
			Key sKeySpec = new SecretKeySpec(keyByte, "AES");

			cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化
			byte[] result = cipher.doFinal(content);
			return result;
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		} catch (NoSuchProviderException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	public static void initialize() {
		if (initialized)
			return;
		Security.addProvider(new BouncyCastleProvider());
		initialized = true;
	}

	// 生成iv
	public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
		AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
		params.init(new IvParameterSpec(iv));
		return params;
	}
}
